3w+15=7w-21

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Solution for 3w+15=7w-21 equation: 



3w+15=7w-21

We move all terms to the left:

3w+15-(7w-21)=0

We get rid of parentheses

3w-7w+21+15=0

We add all the numbers together, and all the variables

-4w+36=0

We move all terms containing w to the left, all other terms to the right

-4w=-36

w=-36/-4

w=+9

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